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Tower Subway opens in London2.8.1870
The Tower Subway is a tunnel beneath the River Thames in central London, between Tower Hill on the north side of the river and Vine Lane (off Tooley Street) to the south. In 1869 a 1,340 foot (410 m) circular tunnel was dug through the London clay using a wrought iron shield, a method that had been patented in 1864 by Peter William Barlow. A 2 ft 6 in (0.76 m) gauge railway was laid in the tunnel and from August 1870 a cable-hauled wooden carriage conveyed passengers from one side to the other. This was uneconomic and the company went bankrupt by the end of the year. The tunnel was converted to pedestrian use and one million people a year crossed, paying a toll of 1⁄2d. When the toll-free Tower Bridge opened in 1894 this caused a drop in income and the tunnel closed in 1898, after being sold to the London Hydraulic Power Company. The tunnel today is used for water mains.
The same method of construction was used in 1890 to dug the tunnels of the City & South London Railway, the first of London's "Tube" railways.
